Table of Contents
SRX Dentistry
Volume 2010, Article ID 295137, 8 pages
http://dx.doi.org/10.3814/2010/295137
Research Article

Effect of Primers and Resins on the Shear Bond Strength of Resin Composite to Zirconia

1BioCity Turku Biomaterials Research Program, Department of Biomaterials Science, Institute of Dentistry, University of Turku, Lemminkaisenkatu 2, 20250 Turku, Finland
2Dental Materials Science, Faculty of Dentistry, The University of Hong Kong, Prince Philip Dental Hospital, 34 Hospital Road, Sai Ying Pun, Hong Kong, China

Received 8 November 2009; Revised 20 December 2009; Accepted 10 January 2010

Copyright © 2010 T. T. Heikkinen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective. To evaluate the effects of various surface conditioning methods and agents. Methods. The intaglio zirconia substrates were air particle abraded with Al2O3 (Ø 50 μm) for 10 s. An air pressure of 450 kPa and a nozzle distance of 10 mm were used. Surface conditioning by groups: A = silane coupling agent  + organophosphate adhesive; B = organophosphate primer + silane coupling agent + organophosphate adhesive; C = organophosphate primer; D = methacrylate adhesive; E = thiophosphate primer + methacrylate adhesive. Composite stubs were bonded to substrates and photo-polymerized. The specimens were thermocycled 8000 times 55±1C and 5±1C and kept in distilled water for 14 d. The shear bond strengths were measured with a universal testing machine. Results. Shear bond strengths (MPa ± SD): Group A 25.8±6.7, Group B 26.5±8.6, Group C 16.7±8.5, Group D 2.6±0.7, and Group E 4.2±1.2. ANOVA: significant differences among groups (P<.05). Groups A and B: mainly cohesive fractures, Group C: mixed or adhesive fractures, Groups D and E: adhesive fractures. Conclusions. A value of 10–13 MPa is the minimum acceptable shear bond strength. Groups A, B, and C exceeded this limit, Groups D and E could not achieve the limit.